8T49N241-999NLGI8

Specialized ICS Overview

The 8T49N241-999NLGI8 is a FemtoClock NG Universal Frequency Translator featuring one fractional-feedback PLL. It generates up to four independent output frequencies ranging from 8kHz to 1GHz using one integer and three fractional output dividers. The device supports LVPECL, LVDS, HCSL, or LVCMOS output levels and accepts multiple input formats including LVPECL, LVDS, LVHSTL, HCSL, LVCMOS, and crystals. It operates on a 2.375V to 3.465V supply within a -40°C to 85°C temperature range. The suffix '999' indicates the unit powers up in a disabled state.

Specialized ICS Feature Summary

• Generates up to four unrelated output frequencies (8kHz to 1GHz) with jitter attenuation capabilities.
• Supports hitless switching between clock inputs with phase-slope limiting options.
• Programmable via I²C interface or external EEPROM for boot configuration.
• Compliant with Telcordia GR-253-CORE and ITU-T G.813/G.8262 standards.

Specialized ICS Applications

• 10G/40G/100G SONET/SDH and Ethernet network line cards
• Wireless base station baseband units
• Carrier Ethernet switches and OTN equipment
• GbE/10GbE/100GbE Synchronous Ethernet applications

Specialized ICS Procurement Notes

Verify the ordering suffix '999' confirms the power-up disabled state requirement for the specific design. Confirm the 40-VFQFN package dimensions match the PCB footprint. Ensure the I²C address configuration aligns with system bus constraints. Check RoHS compliance status against local regulatory requirements before finalizing procurement.

Specialized ICS Selection Notes

Select this model when four independent outputs are required from a single PLL source. Compare against the 8T49N241-998 variant if EEPROM boot functionality is preferred over internal OTP storage. Evaluate the 8T49N242 if fewer than four outputs suffice, as it offers a different pinout. Verify input frequency ranges meet the 8kHz to 875MHz specification.

Specialized ICS Part Context

This component belongs to the FemtoClock NG family of universal frequency translators. It shares core architecture with the 8T49N241 but differs in boot configuration settings defined by the suffix. The device integrates low-phase noise technology suitable for high-speed networking timing applications requiring precise frequency synthesis.

Specialized ICS Replacement Considerations

The 8T49N241-998NLGI8 is a functional alternative differing only in boot behavior (EEPROM vs. OTP). The 8T49N242 series offers similar performance with reduced output count. No direct cross-manufacturer substitutes are documented in public sources.

Specialized ICS FAQ

What does the '999' suffix indicate?

The suffix indicates that the device powers up in a disabled state rather than automatically loading configuration data.

Can the output frequencies be independent of the input?

Yes, all four output frequencies can be completely independent of each other and the input frequencies.

What is the maximum RMS jitter specification?

The device achieves 0.35ps RMS jitter (including spurs) in the 12kHz to 20MHz bandwidth range.